I don’t have many answers for this specific forum in which I’m new :-) But I did have very meaningful relationships online on random forums in the past. One has lasted until now—we chatted nearly every day for 10 years, and in the last years we’ve visited each other from time to time. It feels like a very old and comfortable relationship.
What made me get in that forum (it was a teenager forum that hadn’t any specific aim other than social) in the first place was the lack of availability of fulfilling social relationships around me.
In my prison-like world (horrible school, stressing home), it was a way to get out to find something different, and also to show facets of myself that were more authentic, bolder and more enjoyable. Also, the ubiquity of the availability of the friendship on the same mode across the world (important in my case as I was constantly displaced) made her more or less the most stable thing I could have as a friendship, as no matter where I was, the mode I could see her was always the same. With other friends they’d get bored with the written form and wouldn’t spend so much time anyway, and it’s perfectly okay that they’ll conceive it and do it that way.
Reflecting upon it, I think I have kept something of that form of written competence — how do you convey your tone, make jokes etc, on dating apps. I know, it’s a very different thing and I definitely could tell when conversations hit a point where the other person wants a result and not casually continuing to chat, which at times did upset me.
Just as in the "real" world, when making relationships online I think there is a moment for a rather large buffer zone when you speak about stuff without too much aim and eventually it converges into a relationship. And I don’t know if it is necessarily due to the topic of a forum, it’s more a question of personal affinity.